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Full Discussion: Grep and sed (replace string in patterned lines)
Top Forums Shell Programming and Scripting Grep and sed (replace string in patterned lines) Post 302830655 by unknown7 on Tuesday 9th of July 2013 09:15:37 AM
Old 07-09-2013
Thanks ++
Sometimes you just can wonder why you didn't find it :-)

I now remember that it was possible to add a pattern in front of sed substitution.
I don't want to substitute again, if i was obviously done in steps before. So it should be like

1.) Find PATTERN
2.) Only if element is "to be changed" but NOT ", YEHA! to be changed"
2.1.) than substitute "to be chaned" to ", YEHA! to bechanged"
2.2.) else (do nothing)

Thanks a lot!

final outcome:
Code:
sed '/PATTERN/s/ to be changed/, YEHA! to be changed/' test > tmp_file && mv tmp_file test

---------- Post updated at 03:15 PM ---------- Previous update was at 02:58 PM ----------

can I add a rule checking if substitution was done?

Example:
Input:
blah PATTERN 987654321 blub to be changed

Output after first run or otherwise manipulated: FINE
blah PATTERN 987654321 blub , YEHA! to be changed

Now if I rerun or if this was changed from other sources: SHOULD NOT BE SUBSTITUTED
blah PATTERN 987654321 blub , YEHA! , YEHA! to be changed

Note:
", YEHA! " can be between PATTERN and "to be changed" and rule should substitute if it's not directly in front of "to be changed"

Quote:
IN:
PATTERN 12345... , YEHA ...678 to be changed
PATTERN 12345... , YEHA ...678 , YEHA to be changed

OUT:
PATTERN 12345... , YEHA ...678 , YEHA to be changed
PATTERN 12345... , YEHA ...678 , YEHA to be changed
Last edited by unknown7; 07-09-2013 at 10:26 AM..
 

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LEARN ABOUT OPENDARWIN

fc-pattern

FC-PATTERN(1)															     FC-PATTERN(1)

NAME

       fc-pattern - parse and show pattern

SYNOPSIS

       fc-pattern [ -cdVh ]  [ --config ]  [ --default ]  [  [ -f format ]  [ --format format ]  ]  [ --version ]  [ --help ]

	[ pattern  [ element... ]   ]

DESCRIPTION

       fc-pattern  parses  pattern (empty pattern by default) and shows the parsed result.  If --config is given, config substitution is performed
       on the pattern before being displayed.  If --default is given, default substitution is performed on the pattern before being displayed.

       If any elements are specified, only those are printed.

OPTIONS

       This program follows the usual GNU command line syntax, with long options starting with two dashes (`-'). A summary of options is  included
       below.

       -c     Perform config substitution on pattern.

       -d     Perform default substitution on pattern.

       -f     Format output according to the format specifier format.

       -V     Show version of the program and exit.

       -h     Show summary of options.

       pattern
	      Parses and displays pattern (uses empty pattern by default).

       element
	      If set, the element property is displayed for parsed pattern.

SEE ALSO

       FcNameParse(3)  FcConfigSubstitute(3)  FcDefaultSubstitute(3)  FcPatternPrint(3)  FcPatternFormat(3)  fc-cat(1)	fc-cache(1) fc-list(1) fc-
       match(1) fc-query(1) fc-scan(1)

       The fontconfig user's guide, in HTML format: /usr/share/doc/fontconfig/fontconfig-user.html.

AUTHOR

       This manual page was updated by Behdad Esfahbod <behdad@behdad.org>.

								   Apr 20, 2010 						     FC-PATTERN(1)
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